Commit | Line | Data |
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3e256b8f LRV |
1 | /* |
2 | * Copyright (C) 2011 Instituto Nokia de Tecnologia | |
3 | * | |
4 | * Authors: | |
5 | * Lauro Ramos Venancio <lauro.venancio@openbossa.org> | |
6 | * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the | |
20 | * Free Software Foundation, Inc., | |
21 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 | */ | |
23 | ||
52858b51 | 24 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 25 | |
3e256b8f LRV |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/slab.h> | |
7c7cd3bf | 30 | #include <linux/nfc.h> |
3e256b8f | 31 | |
5df16cad SO |
32 | #include <net/genetlink.h> |
33 | ||
3e256b8f LRV |
34 | #include "nfc.h" |
35 | ||
36 | #define VERSION "0.1" | |
37 | ||
c8d56ae7 EL |
38 | #define NFC_CHECK_PRES_FREQ_MS 2000 |
39 | ||
3e256b8f LRV |
40 | int nfc_devlist_generation; |
41 | DEFINE_MUTEX(nfc_devlist_mutex); | |
42 | ||
8b3fe7b5 IE |
43 | /** |
44 | * nfc_dev_up - turn on the NFC device | |
45 | * | |
46 | * @dev: The nfc device to be turned on | |
47 | * | |
48 | * The device remains up until the nfc_dev_down function is called. | |
49 | */ | |
50 | int nfc_dev_up(struct nfc_dev *dev) | |
51 | { | |
52 | int rc = 0; | |
53 | ||
20c239c1 | 54 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
55 | |
56 | device_lock(&dev->dev); | |
57 | ||
58 | if (!device_is_registered(&dev->dev)) { | |
59 | rc = -ENODEV; | |
60 | goto error; | |
61 | } | |
62 | ||
63 | if (dev->dev_up) { | |
64 | rc = -EALREADY; | |
65 | goto error; | |
66 | } | |
67 | ||
68 | if (dev->ops->dev_up) | |
69 | rc = dev->ops->dev_up(dev); | |
70 | ||
71 | if (!rc) | |
72 | dev->dev_up = true; | |
73 | ||
74 | error: | |
75 | device_unlock(&dev->dev); | |
76 | return rc; | |
77 | } | |
78 | ||
79 | /** | |
80 | * nfc_dev_down - turn off the NFC device | |
81 | * | |
82 | * @dev: The nfc device to be turned off | |
83 | */ | |
84 | int nfc_dev_down(struct nfc_dev *dev) | |
85 | { | |
86 | int rc = 0; | |
87 | ||
20c239c1 | 88 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
89 | |
90 | device_lock(&dev->dev); | |
91 | ||
92 | if (!device_is_registered(&dev->dev)) { | |
93 | rc = -ENODEV; | |
94 | goto error; | |
95 | } | |
96 | ||
97 | if (!dev->dev_up) { | |
98 | rc = -EALREADY; | |
99 | goto error; | |
100 | } | |
101 | ||
90099433 | 102 | if (dev->polling || dev->active_target) { |
8b3fe7b5 IE |
103 | rc = -EBUSY; |
104 | goto error; | |
105 | } | |
106 | ||
107 | if (dev->ops->dev_down) | |
108 | dev->ops->dev_down(dev); | |
109 | ||
110 | dev->dev_up = false; | |
111 | ||
112 | error: | |
113 | device_unlock(&dev->dev); | |
114 | return rc; | |
115 | } | |
116 | ||
3e256b8f LRV |
117 | /** |
118 | * nfc_start_poll - start polling for nfc targets | |
119 | * | |
120 | * @dev: The nfc device that must start polling | |
121 | * @protocols: bitset of nfc protocols that must be used for polling | |
122 | * | |
123 | * The device remains polling for targets until a target is found or | |
124 | * the nfc_stop_poll function is called. | |
125 | */ | |
fe7c5800 | 126 | int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) |
3e256b8f LRV |
127 | { |
128 | int rc; | |
129 | ||
fe7c5800 SO |
130 | pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n", |
131 | dev_name(&dev->dev), im_protocols, tm_protocols); | |
3e256b8f | 132 | |
fe7c5800 | 133 | if (!im_protocols && !tm_protocols) |
3e256b8f LRV |
134 | return -EINVAL; |
135 | ||
136 | device_lock(&dev->dev); | |
137 | ||
138 | if (!device_is_registered(&dev->dev)) { | |
139 | rc = -ENODEV; | |
140 | goto error; | |
141 | } | |
142 | ||
143 | if (dev->polling) { | |
144 | rc = -EBUSY; | |
145 | goto error; | |
146 | } | |
147 | ||
fe7c5800 | 148 | rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); |
f212ad5e | 149 | if (!rc) { |
3e256b8f | 150 | dev->polling = true; |
f212ad5e SO |
151 | dev->rf_mode = NFC_RF_NONE; |
152 | } | |
3e256b8f LRV |
153 | |
154 | error: | |
155 | device_unlock(&dev->dev); | |
156 | return rc; | |
157 | } | |
158 | ||
159 | /** | |
160 | * nfc_stop_poll - stop polling for nfc targets | |
161 | * | |
162 | * @dev: The nfc device that must stop polling | |
163 | */ | |
164 | int nfc_stop_poll(struct nfc_dev *dev) | |
165 | { | |
166 | int rc = 0; | |
167 | ||
20c239c1 | 168 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
169 | |
170 | device_lock(&dev->dev); | |
171 | ||
172 | if (!device_is_registered(&dev->dev)) { | |
173 | rc = -ENODEV; | |
174 | goto error; | |
175 | } | |
176 | ||
177 | if (!dev->polling) { | |
178 | rc = -EINVAL; | |
179 | goto error; | |
180 | } | |
181 | ||
182 | dev->ops->stop_poll(dev); | |
183 | dev->polling = false; | |
184 | ||
185 | error: | |
186 | device_unlock(&dev->dev); | |
187 | return rc; | |
188 | } | |
189 | ||
90099433 EL |
190 | static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx) |
191 | { | |
192 | int i; | |
193 | ||
194 | if (dev->n_targets == 0) | |
195 | return NULL; | |
196 | ||
197 | for (i = 0; i < dev->n_targets ; i++) { | |
198 | if (dev->targets[i].idx == target_idx) | |
199 | return &dev->targets[i]; | |
200 | } | |
201 | ||
202 | return NULL; | |
203 | } | |
204 | ||
47807d3d | 205 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
1ed28f61 SO |
206 | { |
207 | int rc = 0; | |
47807d3d SO |
208 | u8 *gb; |
209 | size_t gb_len; | |
90099433 | 210 | struct nfc_target *target; |
1ed28f61 | 211 | |
47807d3d | 212 | pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); |
1ed28f61 SO |
213 | |
214 | if (!dev->ops->dep_link_up) | |
215 | return -EOPNOTSUPP; | |
216 | ||
217 | device_lock(&dev->dev); | |
218 | ||
219 | if (!device_is_registered(&dev->dev)) { | |
220 | rc = -ENODEV; | |
221 | goto error; | |
222 | } | |
223 | ||
224 | if (dev->dep_link_up == true) { | |
225 | rc = -EALREADY; | |
226 | goto error; | |
227 | } | |
228 | ||
47807d3d SO |
229 | gb = nfc_llcp_general_bytes(dev, &gb_len); |
230 | if (gb_len > NFC_MAX_GT_LEN) { | |
231 | rc = -EINVAL; | |
232 | goto error; | |
233 | } | |
234 | ||
90099433 EL |
235 | target = nfc_find_target(dev, target_index); |
236 | if (target == NULL) { | |
237 | rc = -ENOTCONN; | |
238 | goto error; | |
239 | } | |
240 | ||
241 | rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len); | |
f212ad5e | 242 | if (!rc) { |
90099433 | 243 | dev->active_target = target; |
f212ad5e SO |
244 | dev->rf_mode = NFC_RF_INITIATOR; |
245 | } | |
1ed28f61 SO |
246 | |
247 | error: | |
248 | device_unlock(&dev->dev); | |
249 | return rc; | |
250 | } | |
251 | ||
252 | int nfc_dep_link_down(struct nfc_dev *dev) | |
253 | { | |
254 | int rc = 0; | |
255 | ||
256 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
257 | ||
258 | if (!dev->ops->dep_link_down) | |
259 | return -EOPNOTSUPP; | |
260 | ||
261 | device_lock(&dev->dev); | |
262 | ||
263 | if (!device_is_registered(&dev->dev)) { | |
264 | rc = -ENODEV; | |
265 | goto error; | |
266 | } | |
267 | ||
268 | if (dev->dep_link_up == false) { | |
269 | rc = -EALREADY; | |
270 | goto error; | |
271 | } | |
272 | ||
1ed28f61 SO |
273 | rc = dev->ops->dep_link_down(dev); |
274 | if (!rc) { | |
275 | dev->dep_link_up = false; | |
90099433 | 276 | dev->active_target = NULL; |
d646960f | 277 | nfc_llcp_mac_is_down(dev); |
1ed28f61 SO |
278 | nfc_genl_dep_link_down_event(dev); |
279 | } | |
280 | ||
281 | error: | |
282 | device_unlock(&dev->dev); | |
283 | return rc; | |
284 | } | |
285 | ||
286 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, | |
0a40acb2 | 287 | u8 comm_mode, u8 rf_mode) |
1ed28f61 SO |
288 | { |
289 | dev->dep_link_up = true; | |
1ed28f61 | 290 | |
d646960f SO |
291 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
292 | ||
1ed28f61 SO |
293 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
294 | } | |
295 | EXPORT_SYMBOL(nfc_dep_link_is_up); | |
296 | ||
3e256b8f LRV |
297 | /** |
298 | * nfc_activate_target - prepare the target for data exchange | |
299 | * | |
300 | * @dev: The nfc device that found the target | |
301 | * @target_idx: index of the target that must be activated | |
302 | * @protocol: nfc protocol that will be used for data exchange | |
303 | */ | |
304 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) | |
305 | { | |
306 | int rc; | |
90099433 | 307 | struct nfc_target *target; |
3e256b8f | 308 | |
20c239c1 JP |
309 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
310 | dev_name(&dev->dev), target_idx, protocol); | |
3e256b8f LRV |
311 | |
312 | device_lock(&dev->dev); | |
313 | ||
314 | if (!device_is_registered(&dev->dev)) { | |
315 | rc = -ENODEV; | |
316 | goto error; | |
317 | } | |
318 | ||
90099433 EL |
319 | if (dev->active_target) { |
320 | rc = -EBUSY; | |
321 | goto error; | |
322 | } | |
323 | ||
324 | target = nfc_find_target(dev, target_idx); | |
325 | if (target == NULL) { | |
326 | rc = -ENOTCONN; | |
327 | goto error; | |
328 | } | |
329 | ||
330 | rc = dev->ops->activate_target(dev, target, protocol); | |
c8d56ae7 | 331 | if (!rc) { |
90099433 | 332 | dev->active_target = target; |
f212ad5e | 333 | dev->rf_mode = NFC_RF_INITIATOR; |
3e256b8f | 334 | |
c8d56ae7 EL |
335 | if (dev->ops->check_presence) |
336 | mod_timer(&dev->check_pres_timer, jiffies + | |
337 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
338 | } | |
3e256b8f LRV |
339 | |
340 | error: | |
341 | device_unlock(&dev->dev); | |
342 | return rc; | |
343 | } | |
344 | ||
345 | /** | |
346 | * nfc_deactivate_target - deactivate a nfc target | |
347 | * | |
348 | * @dev: The nfc device that found the target | |
349 | * @target_idx: index of the target that must be deactivated | |
350 | */ | |
351 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) | |
352 | { | |
353 | int rc = 0; | |
354 | ||
20c239c1 JP |
355 | pr_debug("dev_name=%s target_idx=%u\n", |
356 | dev_name(&dev->dev), target_idx); | |
3e256b8f LRV |
357 | |
358 | device_lock(&dev->dev); | |
359 | ||
360 | if (!device_is_registered(&dev->dev)) { | |
361 | rc = -ENODEV; | |
362 | goto error; | |
363 | } | |
364 | ||
90099433 EL |
365 | if (dev->active_target == NULL) { |
366 | rc = -ENOTCONN; | |
367 | goto error; | |
368 | } | |
369 | ||
370 | if (dev->active_target->idx != target_idx) { | |
371 | rc = -ENOTCONN; | |
372 | goto error; | |
373 | } | |
374 | ||
c8d56ae7 EL |
375 | if (dev->ops->check_presence) |
376 | del_timer_sync(&dev->check_pres_timer); | |
377 | ||
90099433 EL |
378 | dev->ops->deactivate_target(dev, dev->active_target); |
379 | dev->active_target = NULL; | |
3e256b8f LRV |
380 | |
381 | error: | |
382 | device_unlock(&dev->dev); | |
383 | return rc; | |
384 | } | |
385 | ||
386 | /** | |
387 | * nfc_data_exchange - transceive data | |
388 | * | |
389 | * @dev: The nfc device that found the target | |
390 | * @target_idx: index of the target | |
391 | * @skb: data to be sent | |
392 | * @cb: callback called when the response is received | |
393 | * @cb_context: parameter for the callback function | |
394 | * | |
395 | * The user must wait for the callback before calling this function again. | |
396 | */ | |
0a40acb2 SO |
397 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
398 | data_exchange_cb_t cb, void *cb_context) | |
3e256b8f LRV |
399 | { |
400 | int rc; | |
401 | ||
20c239c1 JP |
402 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
403 | dev_name(&dev->dev), target_idx, skb->len); | |
3e256b8f LRV |
404 | |
405 | device_lock(&dev->dev); | |
406 | ||
407 | if (!device_is_registered(&dev->dev)) { | |
408 | rc = -ENODEV; | |
409 | kfree_skb(skb); | |
410 | goto error; | |
411 | } | |
412 | ||
be9ae4ce SO |
413 | if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) { |
414 | if (dev->active_target->idx != target_idx) { | |
415 | rc = -EADDRNOTAVAIL; | |
416 | kfree_skb(skb); | |
417 | goto error; | |
418 | } | |
144612ca | 419 | |
be9ae4ce SO |
420 | if (dev->ops->check_presence) |
421 | del_timer_sync(&dev->check_pres_timer); | |
422 | ||
423 | rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb, | |
424 | cb_context); | |
425 | ||
426 | if (!rc && dev->ops->check_presence) | |
427 | mod_timer(&dev->check_pres_timer, jiffies + | |
428 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
429 | } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) { | |
430 | rc = dev->ops->tm_send(dev, skb); | |
431 | } else { | |
432 | rc = -ENOTCONN; | |
144612ca EL |
433 | kfree_skb(skb); |
434 | goto error; | |
435 | } | |
436 | ||
c8d56ae7 | 437 | |
3e256b8f LRV |
438 | error: |
439 | device_unlock(&dev->dev); | |
440 | return rc; | |
441 | } | |
442 | ||
541d920b SO |
443 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
444 | { | |
0a40acb2 | 445 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
541d920b SO |
446 | |
447 | if (gb_len > NFC_MAX_GT_LEN) | |
448 | return -EINVAL; | |
449 | ||
d646960f | 450 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
541d920b SO |
451 | } |
452 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); | |
453 | ||
ab73b751 SO |
454 | u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) |
455 | { | |
456 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
457 | ||
458 | return nfc_llcp_general_bytes(dev, gb_len); | |
459 | } | |
460 | EXPORT_SYMBOL(nfc_get_local_general_bytes); | |
461 | ||
73167ced SO |
462 | int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
463 | { | |
464 | /* Only LLCP target mode for now */ | |
465 | if (dev->dep_link_up == false) { | |
466 | kfree_skb(skb); | |
467 | return -ENOLINK; | |
468 | } | |
469 | ||
470 | return nfc_llcp_data_received(dev, skb); | |
471 | } | |
472 | EXPORT_SYMBOL(nfc_tm_data_received); | |
473 | ||
fc40a8c1 SO |
474 | int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, |
475 | u8 *gb, size_t gb_len) | |
476 | { | |
477 | int rc; | |
478 | ||
479 | device_lock(&dev->dev); | |
480 | ||
481 | dev->polling = false; | |
482 | ||
483 | if (gb != NULL) { | |
484 | rc = nfc_set_remote_general_bytes(dev, gb, gb_len); | |
485 | if (rc < 0) | |
486 | goto out; | |
487 | } | |
488 | ||
f212ad5e SO |
489 | dev->rf_mode = NFC_RF_TARGET; |
490 | ||
fc40a8c1 SO |
491 | if (protocol == NFC_PROTO_NFC_DEP_MASK) |
492 | nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET); | |
493 | ||
494 | rc = nfc_genl_tm_activated(dev, protocol); | |
495 | ||
496 | out: | |
497 | device_unlock(&dev->dev); | |
498 | ||
499 | return rc; | |
500 | } | |
501 | EXPORT_SYMBOL(nfc_tm_activated); | |
502 | ||
503 | int nfc_tm_deactivated(struct nfc_dev *dev) | |
504 | { | |
505 | dev->dep_link_up = false; | |
506 | ||
507 | return nfc_genl_tm_deactivated(dev); | |
508 | } | |
509 | EXPORT_SYMBOL(nfc_tm_deactivated); | |
510 | ||
3e256b8f | 511 | /** |
7c7cd3bf | 512 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
3e256b8f LRV |
513 | * |
514 | * @size: size to allocate | |
515 | * @gfp: gfp flags | |
516 | */ | |
7c7cd3bf | 517 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
0a40acb2 SO |
518 | unsigned int flags, unsigned int size, |
519 | unsigned int *err) | |
7c7cd3bf SO |
520 | { |
521 | struct sk_buff *skb; | |
522 | unsigned int total_size; | |
523 | ||
524 | total_size = size + | |
525 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
526 | ||
527 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); | |
528 | if (skb) | |
529 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
530 | ||
531 | return skb; | |
532 | } | |
533 | ||
534 | /** | |
535 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses | |
536 | * | |
537 | * @size: size to allocate | |
538 | * @gfp: gfp flags | |
539 | */ | |
540 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) | |
3e256b8f LRV |
541 | { |
542 | struct sk_buff *skb; | |
543 | unsigned int total_size; | |
544 | ||
545 | total_size = size + 1; | |
546 | skb = alloc_skb(total_size, gfp); | |
547 | ||
548 | if (skb) | |
549 | skb_reserve(skb, 1); | |
550 | ||
551 | return skb; | |
552 | } | |
7c7cd3bf | 553 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
3e256b8f | 554 | |
4d12b8b1 LRV |
555 | /** |
556 | * nfc_targets_found - inform that targets were found | |
557 | * | |
558 | * @dev: The nfc device that found the targets | |
559 | * @targets: array of nfc targets found | |
560 | * @ntargets: targets array size | |
561 | * | |
562 | * The device driver must call this function when one or many nfc targets | |
563 | * are found. After calling this function, the device driver must stop | |
564 | * polling for targets. | |
d94f9c55 EL |
565 | * NOTE: This function can be called with targets=NULL and n_targets=0 to |
566 | * notify a driver error, meaning that the polling operation cannot complete. | |
d4ccb132 EL |
567 | * IMPORTANT: this function must not be called from an atomic context. |
568 | * In addition, it must also not be called from a context that would prevent | |
569 | * the NFC Core to call other nfc ops entry point concurrently. | |
4d12b8b1 | 570 | */ |
0a40acb2 SO |
571 | int nfc_targets_found(struct nfc_dev *dev, |
572 | struct nfc_target *targets, int n_targets) | |
4d12b8b1 | 573 | { |
c4fbb651 SO |
574 | int i; |
575 | ||
20c239c1 | 576 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
4d12b8b1 | 577 | |
c4fbb651 | 578 | for (i = 0; i < n_targets; i++) |
01ae0eea | 579 | targets[i].idx = dev->target_next_idx++; |
c4fbb651 | 580 | |
d4ccb132 | 581 | device_lock(&dev->dev); |
4d12b8b1 | 582 | |
8668fdd6 EL |
583 | if (dev->polling == false) { |
584 | device_unlock(&dev->dev); | |
585 | return 0; | |
586 | } | |
587 | ||
588 | dev->polling = false; | |
589 | ||
4d12b8b1 LRV |
590 | dev->targets_generation++; |
591 | ||
592 | kfree(dev->targets); | |
d94f9c55 | 593 | dev->targets = NULL; |
4d12b8b1 | 594 | |
d94f9c55 EL |
595 | if (targets) { |
596 | dev->targets = kmemdup(targets, | |
597 | n_targets * sizeof(struct nfc_target), | |
598 | GFP_ATOMIC); | |
599 | ||
600 | if (!dev->targets) { | |
601 | dev->n_targets = 0; | |
602 | device_unlock(&dev->dev); | |
603 | return -ENOMEM; | |
604 | } | |
4d12b8b1 LRV |
605 | } |
606 | ||
607 | dev->n_targets = n_targets; | |
d4ccb132 | 608 | device_unlock(&dev->dev); |
4d12b8b1 LRV |
609 | |
610 | nfc_genl_targets_found(dev); | |
611 | ||
612 | return 0; | |
613 | } | |
614 | EXPORT_SYMBOL(nfc_targets_found); | |
615 | ||
d4ccb132 EL |
616 | /** |
617 | * nfc_target_lost - inform that an activated target went out of field | |
618 | * | |
619 | * @dev: The nfc device that had the activated target in field | |
620 | * @target_idx: the nfc index of the target | |
621 | * | |
622 | * The device driver must call this function when the activated target | |
623 | * goes out of the field. | |
624 | * IMPORTANT: this function must not be called from an atomic context. | |
625 | * In addition, it must also not be called from a context that would prevent | |
626 | * the NFC Core to call other nfc ops entry point concurrently. | |
627 | */ | |
e1da0efa EL |
628 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
629 | { | |
630 | struct nfc_target *tg; | |
631 | int i; | |
632 | ||
633 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); | |
634 | ||
d4ccb132 | 635 | device_lock(&dev->dev); |
e1da0efa EL |
636 | |
637 | for (i = 0; i < dev->n_targets; i++) { | |
638 | tg = &dev->targets[i]; | |
639 | if (tg->idx == target_idx) | |
640 | break; | |
641 | } | |
642 | ||
643 | if (i == dev->n_targets) { | |
d4ccb132 | 644 | device_unlock(&dev->dev); |
e1da0efa EL |
645 | return -EINVAL; |
646 | } | |
647 | ||
648 | dev->targets_generation++; | |
649 | dev->n_targets--; | |
90099433 | 650 | dev->active_target = NULL; |
e1da0efa EL |
651 | |
652 | if (dev->n_targets) { | |
653 | memcpy(&dev->targets[i], &dev->targets[i + 1], | |
654 | (dev->n_targets - i) * sizeof(struct nfc_target)); | |
655 | } else { | |
656 | kfree(dev->targets); | |
657 | dev->targets = NULL; | |
658 | } | |
659 | ||
d4ccb132 | 660 | device_unlock(&dev->dev); |
e1da0efa EL |
661 | |
662 | nfc_genl_target_lost(dev, target_idx); | |
663 | ||
664 | return 0; | |
665 | } | |
666 | EXPORT_SYMBOL(nfc_target_lost); | |
667 | ||
9eb334ac | 668 | inline void nfc_driver_failure(struct nfc_dev *dev, int err) |
456411ca | 669 | { |
9eb334ac | 670 | nfc_targets_found(dev, NULL, 0); |
456411ca EL |
671 | } |
672 | EXPORT_SYMBOL(nfc_driver_failure); | |
673 | ||
3e256b8f LRV |
674 | static void nfc_release(struct device *d) |
675 | { | |
676 | struct nfc_dev *dev = to_nfc_dev(d); | |
677 | ||
20c239c1 | 678 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 679 | |
c8d56ae7 EL |
680 | if (dev->ops->check_presence) { |
681 | del_timer_sync(&dev->check_pres_timer); | |
474fee3d | 682 | cancel_work_sync(&dev->check_pres_work); |
c8d56ae7 EL |
683 | } |
684 | ||
4d12b8b1 LRV |
685 | nfc_genl_data_exit(&dev->genl_data); |
686 | kfree(dev->targets); | |
3e256b8f LRV |
687 | kfree(dev); |
688 | } | |
689 | ||
c8d56ae7 EL |
690 | static void nfc_check_pres_work(struct work_struct *work) |
691 | { | |
692 | struct nfc_dev *dev = container_of(work, struct nfc_dev, | |
693 | check_pres_work); | |
694 | int rc; | |
695 | ||
696 | device_lock(&dev->dev); | |
697 | ||
90099433 EL |
698 | if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) { |
699 | rc = dev->ops->check_presence(dev, dev->active_target); | |
632c016a EL |
700 | if (rc == -EOPNOTSUPP) |
701 | goto exit; | |
c8d56ae7 EL |
702 | if (!rc) { |
703 | mod_timer(&dev->check_pres_timer, jiffies + | |
704 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
705 | } else { | |
d4ccb132 EL |
706 | u32 active_target_idx = dev->active_target->idx; |
707 | device_unlock(&dev->dev); | |
708 | nfc_target_lost(dev, active_target_idx); | |
709 | return; | |
c8d56ae7 EL |
710 | } |
711 | } | |
712 | ||
632c016a | 713 | exit: |
c8d56ae7 EL |
714 | device_unlock(&dev->dev); |
715 | } | |
716 | ||
717 | static void nfc_check_pres_timeout(unsigned long data) | |
718 | { | |
719 | struct nfc_dev *dev = (struct nfc_dev *)data; | |
720 | ||
916082b0 | 721 | schedule_work(&dev->check_pres_work); |
c8d56ae7 EL |
722 | } |
723 | ||
3e256b8f LRV |
724 | struct class nfc_class = { |
725 | .name = "nfc", | |
726 | .dev_release = nfc_release, | |
727 | }; | |
728 | EXPORT_SYMBOL(nfc_class); | |
729 | ||
730 | static int match_idx(struct device *d, void *data) | |
731 | { | |
732 | struct nfc_dev *dev = to_nfc_dev(d); | |
95c96174 | 733 | unsigned int *idx = data; |
3e256b8f LRV |
734 | |
735 | return dev->idx == *idx; | |
736 | } | |
737 | ||
95c96174 | 738 | struct nfc_dev *nfc_get_device(unsigned int idx) |
3e256b8f LRV |
739 | { |
740 | struct device *d; | |
741 | ||
742 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); | |
743 | if (!d) | |
744 | return NULL; | |
745 | ||
746 | return to_nfc_dev(d); | |
747 | } | |
748 | ||
749 | /** | |
750 | * nfc_allocate_device - allocate a new nfc device | |
751 | * | |
752 | * @ops: device operations | |
753 | * @supported_protocols: NFC protocols supported by the device | |
754 | */ | |
755 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, | |
0a40acb2 SO |
756 | u32 supported_protocols, |
757 | int tx_headroom, int tx_tailroom) | |
3e256b8f LRV |
758 | { |
759 | static atomic_t dev_no = ATOMIC_INIT(0); | |
760 | struct nfc_dev *dev; | |
761 | ||
762 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || | |
be9ae4ce | 763 | !ops->deactivate_target || !ops->im_transceive) |
3e256b8f LRV |
764 | return NULL; |
765 | ||
766 | if (!supported_protocols) | |
767 | return NULL; | |
768 | ||
769 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); | |
770 | if (!dev) | |
771 | return NULL; | |
772 | ||
773 | dev->dev.class = &nfc_class; | |
774 | dev->idx = atomic_inc_return(&dev_no) - 1; | |
775 | dev_set_name(&dev->dev, "nfc%d", dev->idx); | |
776 | device_initialize(&dev->dev); | |
777 | ||
778 | dev->ops = ops; | |
779 | dev->supported_protocols = supported_protocols; | |
e8753043 SO |
780 | dev->tx_headroom = tx_headroom; |
781 | dev->tx_tailroom = tx_tailroom; | |
3e256b8f | 782 | |
4d12b8b1 LRV |
783 | nfc_genl_data_init(&dev->genl_data); |
784 | ||
d4ccb132 | 785 | |
4d12b8b1 LRV |
786 | /* first generation must not be 0 */ |
787 | dev->targets_generation = 1; | |
788 | ||
c8d56ae7 | 789 | if (ops->check_presence) { |
c8d56ae7 EL |
790 | init_timer(&dev->check_pres_timer); |
791 | dev->check_pres_timer.data = (unsigned long)dev; | |
792 | dev->check_pres_timer.function = nfc_check_pres_timeout; | |
793 | ||
794 | INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); | |
c8d56ae7 EL |
795 | } |
796 | ||
3e256b8f LRV |
797 | return dev; |
798 | } | |
799 | EXPORT_SYMBOL(nfc_allocate_device); | |
800 | ||
801 | /** | |
802 | * nfc_register_device - register a nfc device in the nfc subsystem | |
803 | * | |
804 | * @dev: The nfc device to register | |
805 | */ | |
806 | int nfc_register_device(struct nfc_dev *dev) | |
807 | { | |
808 | int rc; | |
809 | ||
20c239c1 | 810 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
811 | |
812 | mutex_lock(&nfc_devlist_mutex); | |
813 | nfc_devlist_generation++; | |
814 | rc = device_add(&dev->dev); | |
815 | mutex_unlock(&nfc_devlist_mutex); | |
816 | ||
4d12b8b1 LRV |
817 | if (rc < 0) |
818 | return rc; | |
819 | ||
d646960f SO |
820 | rc = nfc_llcp_register_device(dev); |
821 | if (rc) | |
822 | pr_err("Could not register llcp device\n"); | |
823 | ||
4d12b8b1 LRV |
824 | rc = nfc_genl_device_added(dev); |
825 | if (rc) | |
20c239c1 JP |
826 | pr_debug("The userspace won't be notified that the device %s was added\n", |
827 | dev_name(&dev->dev)); | |
4d12b8b1 LRV |
828 | |
829 | return 0; | |
3e256b8f LRV |
830 | } |
831 | EXPORT_SYMBOL(nfc_register_device); | |
832 | ||
833 | /** | |
834 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem | |
835 | * | |
836 | * @dev: The nfc device to unregister | |
837 | */ | |
838 | void nfc_unregister_device(struct nfc_dev *dev) | |
839 | { | |
4d12b8b1 LRV |
840 | int rc; |
841 | ||
20c239c1 | 842 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
843 | |
844 | mutex_lock(&nfc_devlist_mutex); | |
845 | nfc_devlist_generation++; | |
846 | ||
847 | /* lock to avoid unregistering a device while an operation | |
848 | is in progress */ | |
849 | device_lock(&dev->dev); | |
850 | device_del(&dev->dev); | |
851 | device_unlock(&dev->dev); | |
852 | ||
853 | mutex_unlock(&nfc_devlist_mutex); | |
4d12b8b1 | 854 | |
d646960f SO |
855 | nfc_llcp_unregister_device(dev); |
856 | ||
4d12b8b1 LRV |
857 | rc = nfc_genl_device_removed(dev); |
858 | if (rc) | |
20c239c1 JP |
859 | pr_debug("The userspace won't be notified that the device %s was removed\n", |
860 | dev_name(&dev->dev)); | |
4d12b8b1 | 861 | |
3e256b8f LRV |
862 | } |
863 | EXPORT_SYMBOL(nfc_unregister_device); | |
864 | ||
865 | static int __init nfc_init(void) | |
866 | { | |
4d12b8b1 LRV |
867 | int rc; |
868 | ||
ed1e0ad8 | 869 | pr_info("NFC Core ver %s\n", VERSION); |
3e256b8f | 870 | |
4d12b8b1 LRV |
871 | rc = class_register(&nfc_class); |
872 | if (rc) | |
873 | return rc; | |
874 | ||
875 | rc = nfc_genl_init(); | |
876 | if (rc) | |
877 | goto err_genl; | |
878 | ||
879 | /* the first generation must not be 0 */ | |
880 | nfc_devlist_generation = 1; | |
881 | ||
23b7869c LRV |
882 | rc = rawsock_init(); |
883 | if (rc) | |
884 | goto err_rawsock; | |
885 | ||
d646960f SO |
886 | rc = nfc_llcp_init(); |
887 | if (rc) | |
888 | goto err_llcp_sock; | |
889 | ||
c7fe3b52 AAJ |
890 | rc = af_nfc_init(); |
891 | if (rc) | |
892 | goto err_af_nfc; | |
893 | ||
4d12b8b1 LRV |
894 | return 0; |
895 | ||
c7fe3b52 | 896 | err_af_nfc: |
d646960f SO |
897 | nfc_llcp_exit(); |
898 | err_llcp_sock: | |
23b7869c LRV |
899 | rawsock_exit(); |
900 | err_rawsock: | |
c7fe3b52 | 901 | nfc_genl_exit(); |
4d12b8b1 LRV |
902 | err_genl: |
903 | class_unregister(&nfc_class); | |
904 | return rc; | |
3e256b8f LRV |
905 | } |
906 | ||
907 | static void __exit nfc_exit(void) | |
908 | { | |
c7fe3b52 | 909 | af_nfc_exit(); |
d646960f | 910 | nfc_llcp_exit(); |
23b7869c | 911 | rawsock_exit(); |
4d12b8b1 | 912 | nfc_genl_exit(); |
3e256b8f LRV |
913 | class_unregister(&nfc_class); |
914 | } | |
915 | ||
916 | subsys_initcall(nfc_init); | |
917 | module_exit(nfc_exit); | |
918 | ||
919 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); | |
920 | MODULE_DESCRIPTION("NFC Core ver " VERSION); | |
921 | MODULE_VERSION(VERSION); | |
922 | MODULE_LICENSE("GPL"); | |
1155bb61 | 923 | MODULE_ALIAS_NETPROTO(PF_NFC); |
5df16cad | 924 | MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME); |